System and method for pre-distorting a device input

Abstract

A method for pre-distorting an input for a device is provided. A partial set of known data pairs is acquired during a closed-loop device calibration period. The partial set of known data pairs is searched for at least one missing data pair, and at least one data value is interpolated for the missing data pair. An augmented set of data pairs, including the known data pairs and the interpolated data value, is stored in a lookup table. During an open-loop operation period subsequent to the closed-loop device calibration period, the device input is pre-distorted based on the augmented set of data pairs stored in the lookup table.

Description

FIELD OF THE INVENTION[0001]The invention relates generally to digital data interpolation, and more particularly to interpolation of digital data for on-the-fly generation of lookup tables and pre-distortion of a device input.BACKGROUND OF THE INVENTION[0002]A control system utilizes a device or set of devices to regulate, direct or manage the behavior of systems or other devices. There are various types of control systems, including closed loop systems and open loop systems. Closed loop systems employ feedback, whereas open loop systems use prearranged schemes instead of feedback.[0003]Control systems are used in a multitude of applications in electrical and electronic systems and devices. For example, control systems are used in wireless transmitters and receivers, speaker systems, televisions, computers, and many other applications. One function of control systems in these applications is to ensure that components, such as linear or nonlinear devices, achieve a desired output. Fo...

AI Technical Summary

Problems solved by technology

However, some nonlinear devices operate more efficiently when the output response is nonlinear—for example, when a power amplifier approaches saturation.

As a result, there is often a tradeoff between waveform quality and efficiency.

For example, if a nonlinear device is set to operate in linear regions to meet quality standards or requirements, then power consumption and current drain may be degraded because the device is operating at a lower efficiency level.

Alternatively, if a nonlinear device approaches saturation or starts to exhibit nonlinear qualities (which may improve efficiency), the waveform quality may be degraded and may not meet the specific requirements and standards.

A potential disadvantage of this open-loop control is that the nonlinearities of the device may change over time due.

As a result, the pre-distortion function may no longer match the actual nonlinearities of the device, and the device may fail to provide the desired linear output.

A potential disadvantage of this approach, however, is that it may increase power consumption due to the increased logic or circuitry required for the feedback loop and real-time calculation of the pre-distortion function.

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